johnson



Jan. 24, 1956 J. A. JOHNSON WATER-COOLED GAS SAMPLING DEVICE Filed Jan,5, 1954 United States Patent() 2,731,832 WATER-COOLED GAS SAMPLINGDEVICE James A. Johnson, Rahway, N. J., assigner to The American MetalCompany, Ltd., New York, N. Y., a corporation of New York ApplicationJanuary 5, 1954, Serial No. 402,268

1 Claim. (Cl. 73-421.5)

The present invention relates to a gas sampling device forA use in theperiodic or continuous analysis of gases from reverberatory metalsmelting furnaces and the like and aims to provide certain improvementstherein.

t e sampling of corrosive dust laden gases at elevated reduced.

A fur which diierential expansion and mental elTects upon A stillfurther object of the invention is to provide a gas sampling devicewhich will permit easy replacement of the gas sampling tube whenrequired.

The foregoing and other objects of the invention not specificallyenumerated are accomplished by forming a gas sampling device ashereinafter described and shown in the accompanying drawing, wherein:

Figure 1 is a diametrical section of a gas sampling device embodying theinvention.

Fig. 2 is a fractional view similar to Fig. l showing a modification.

the gas sampling device may be said to consist of a tubular metal casing-heavy or thick wall posed in spaced relation betweenv the and thecasing 10.

e casing 10 is except for passages 16 I accommodating the pipes l2 and13, respectively. vSaid shown at 19."A

accommodating a water educt or discharge pipe (not shown) vT-fittin'g 24connection of a hose thereto for blowing-out the tube.

13 may be suitably formed of pipe and at its end which projectsoutpreferably terminates about 4 to 6 inches from the end wall 14 andthe distance between said educt end and said end wall should be at leastas large as the diameter of the casing 10.

In Fig. 2, a manganese bronze section 22a is shown as detachably coupledto the inner end 13 and the end wall 14 of the casing.

In use, the gas sampling device, after being installed so that one endextends into the corrosive gas atmosphere of a reverberatory metalsmelting furnace and the like for a distance of from 18 to 24 inches,will be exposed to the bronze section 22 or 22a, and upon filling thecasing, discharging therefrom through the discharge, nipple 20. In thecourse of this owing action the water will conduct Patentedv Jan. y24,12956j he casing, as shown".t

Threaded into the vother is a screwplugv`25y which".`

heat ,away fromithe inserted: end of the casing and the Althoughcertainpreferred embodiments of the'inventubular section 22 or 22a. Therate of ow of the water tion have been disclosed, it is to be understoodthat changes is so controlled that the ltemperature of the endv 11 ofthe in the specic construction, arrangement;V of parts yand of casingwill not be cooled down to the dew point of the materials used may beresorted to within the range of gases within the furnace and hence willpreclude the con- 5 mechanical and engineering skill without departingfrom densation of such gases on the parts of the device exposed thespirit of the invention as claimed: to the gases whereby a corrosivesolution would be formed What l claim is: Y which would eat away theparts in question. By the A device for sampling gas from a reverberatorymetal Y same token, the thickened steel wall of the casing 10 pro-Vsmelting furnace and the like comprising in combination, vides a poorconductor of the heat from the furnace to V1i) a tubular metal casingone end of which is adapted to be the circulating water and hence thetemperature at the located inthe gaseous atmosphere of the furnace, saidcas-5v outer surface of the casing in use is not cooled down to inghaving mounted therein a gas sampling tube the gas the dew point of thegases within the furnace, The intake end of which terminates in and issecured to an end thickened wall on the manganese bronze sections 22 andWall 0f the Casing which iS adapted tOvbe located lin the 22a providesincreased life for said section of the gas 15 gaSOuS atmesphefe and aWater Supply tube extending sampling tube since it is said portion ofthe tube which is through and beug Secured t0 au' eud Wall 0f theCasing, subject to the greatest corrosive action of the furnace SaidWater tube beine disposed in spaced relation between gase5 the gassampling tube and the side Wall of the casing and Experience has taughtthatcorrosion will slowly take eHCOmPaSSug the gas Sampling tube fel thegreater Part place at the entrance end of the gas sampling tube which 2oof its length, theend walls Closing @if the casing except is disposedwithin the furnace and in the course of time, fer passages fer thetubes, ene end of said gas sampling, the inner wall of the tube will beeaten away along a contube extending through the COfleSPOndBg end Gfthe" icai'path from the open end of the tube to about one-third Water'Supply tube and adapted for Connection with means" the distance fromthe end wall 14 to the educt end of the ,for aspu'auug gas from thefurnace atmosphere, the Water water Supply pipe 13 v 25 supply tubehaving its water induct end spaced inwardly" Should it become necessaryto replace the gas sampling from the Outlet eud 0f theges Sampling tubeund a {teelt-ed tube, this can be readily accomplished by removing thegland et Stud eud 0f Said Water Supply' tube eugegu device from thefurnace, disconnecting the sampling tube afeuud the gu? Samplug tubeWueeby Said Sampling tube' from the r-fitting 24, melting away thebrazen joints z3 may move axlelly due te expenelen and contraction,relai,

and withdrawing the tube from the easing.L since it is so tively tethewafer Supply tube and te the easing. only the short section of thegas sampling tube through which the gas enters that becomes corroded, itwill be ap- References Cited in the file of this patent f f parent thatthe section 22 or 22a only, will require re- `UNITED STATESV PATENTS iPlacement i 1809 3'24 A t' 1 Y t Experience has shown that, whereas gassampling tubes 35 1890592 Y 'stlnmef ".""'1')J;nc'1" heretofore used inthe analysis of gases from reverber- 2356845 Hines' Aug' 29' 194,4 atorymetal smelting furnaces had a useful life of from 5501933 My 1 1951;'

two to three weeks, the device of the present invention has shown auseful life of up to a year and more.

